

ABSTRACT

The invention concerns a process for the manufacture of thermoplastic polyurethanes wherein an organic polyisocyanate is made to polymerize with a polyol (reactive with same isocyanate) in the presence of a chain extending agent having a molecular weight lower than 400, under continuous stirring, at a temperature higher than 150 DEG C and for a time sufficient to obtain a product having a melt flow index lower than 25 g/10&#39;.



